fix: Disable generation of criterion HTML graphs

Because we pin the benchmark runs to single cores, and criterion hence
runs the report generation also on those cores, and based on `top`
output it appears as this is parallelized and hence may interfere
with the benchmark runs.

neqo-transport/Cargo.toml

@@ -21,7 +21,7 @@ qlog = { version = "0.12", default-features = false }
 smallvec = { version = "1.11", default-features = false }
 
 [dev-dependencies]
-criterion = { version = "0.5", default-features = false, features = ["html_reports"] }
+criterion = { version = "0.5", default-features = false }
 enum-map = { version = "2.7", default-features = false }
 test-fixture = { path = "../test-fixture" }